CN104457071A - Method for controlling electric compressor of heat pump system for an automotive vehicle - Google Patents

Method for controlling electric compressor of heat pump system for an automotive vehicle Download PDF

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Publication number
CN104457071A
CN104457071A CN201410491879.4A CN201410491879A CN104457071A CN 104457071 A CN104457071 A CN 104457071A CN 201410491879 A CN201410491879 A CN 201410491879A CN 104457071 A CN104457071 A CN 104457071A
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China
Prior art keywords
mentioned
revolution
compressor
discharge pressure
temperature
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Granted
Application number
CN201410491879.4A
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Chinese (zh)
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CN104457071B (en
Inventor
金学圭
姜成镐
李尚耆
崔永镐
李裁旻
李祯宰
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Hanon Systems Corp
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Halla Climate Control Corp
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3204—Cooling devices using compression
    • B60H1/3205—Control means therefor
    • B60H1/3216—Control means therefor for improving a change in operation duty of a compressor in a vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/025—Motor control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H2001/3236—Cooling devices information from a variable is obtained
    • B60H2001/3248—Cooling devices information from a variable is obtained related to pressure
    • B60H2001/325—Cooling devices information from a variable is obtained related to pressure of the refrigerant at a compressing unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H2001/3269—Cooling devices output of a control signal
    • B60H2001/327—Cooling devices output of a control signal related to a compressing unit
    • B60H2001/3272—Cooling devices output of a control signal related to a compressing unit to control the revolving speed of a compressor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H2001/3286—Constructional features
    • B60H2001/3292—Compressor drive is electric only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/07—Exceeding a certain pressure value in a refrigeration component or cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/12—Sound
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/19—Calculation of parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2104—Temperatures of an indoor room or compartment

Abstract

The invention relates to a method for controlling an electromotive compressor in a heat pump system for a vehicle. In accordance with an embodiment of the present invention, an unexpected cutoff of a compressor attributable to overload and the generation of noise and vibration attributable to frequent restarts can be prevented by controlling the number of rotations of the compressor within a specific range based on the discharge pressure of the compressor.

Description

The control method of the motor compressor of vehicle heat pump
Technical field
The present invention relates to the control method of motor compressor, relate to the control method of the motor compressor of vehicle heat pump in more detail, the revolution of compressor is controlled according to the discharge pressure of compressor, can prevent thus in vehicle heat pump, compressor is out-of-work phenomenon unexpectedly.
Background technology
Usually, heat pump refers to, utilize the air handling system that a refrigerant system performs refrigeration simultaneously and heats, above-mentioned heat pump comprises compressor, indoor heat converter, outdoor heat converter, expansion valve and direction control valve.
With regard to heat pump, when freezing, cold-producing medium circulates through the path of compressor, outdoor heat converter, expansion valve, indoor heat converter, compressor; When heating, cold-producing medium circulates through the path of compressor, indoor heat converter, expansion valve, outdoor heat converter, compressor.
That is, when freezing, indoor heat converter carrys out work as evaporimeter, and outdoor heat converter carrys out work as condenser; When heating, indoor heat converter carrys out work as condenser, and outdoor heat converter carrys out work as evaporimeter.
Fig. 1 is for illustrating the structure chart of existing vehicle heat pump disclosed in No. 10-2008-0026983rd, Korean Patent Laid (patent document 1), existing vehicle heat pump comprises compressor 10 and indoor heat converter 20, the refrigerant compression of vaporization is become the gas of high temperature, high pressure by compressor 10, and indoor heat converter 20 makes the high temperature of compression, the cold-producing medium of high pressure and extraneous air carry out heat exchange.
Existing vehicle heat pump comprises expansion valve 30, outdoor heat converter 40 and inner heat exchanger 50, above-mentioned expansion valve 30 makes the cold-producing medium carrying out heat exchange in indoor heat converter 20 expand into the cold-producing medium of low temperature, low pressure, outdoor heat converter 40 is after the cold-producing medium inflow making the low temperature of expansion, low pressure, make the air of this cold-producing medium and periphery carry out heat exchange, thus be vaporized.Especially, outdoor heat converter 40 is arranged at the outdoor of vehicle, for absorbing the heat of surrounding, and makes the refrigerants vaporize of low temperature, low pressure.
Inner heat exchanger 50 makes the outlet side cold-producing medium of indoor heat converter 20 and the outlet side cold-producing medium of outdoor heat converter 40 mutually carry out heat exchange, for forcibly reducing the outlet side refrigerant temperature of indoor heat converter 20.
Inner heat exchanger 50 has corresponding first flow path 52 and the second stream 54, the cold-producing medium of the high temperature that first flow path 52 can make heat exchanger 20 indoor flow to expansion valve 30 passes through, the cold-producing medium of the low temperature that the second stream 54 can make heat exchanger 40 outdoor flow to compressor 10 passes through, by the cold-producing medium of the high temperature of above-mentioned first flow path 52 with mutually carry out heat exchange by the cold-producing medium of the low temperature of the second stream 54.
Now, comprise heating unit 60, above-mentioned heating unit 60 heats the cold-producing medium that the second stream 54 from inner heat exchanger 50 flows to compressor 10, heating unit 60 can be made up of heat ray or positive temperature coefficient (PTC, Positive Temperature Coefficient) heater 62.
But, with regard to this existing vehicle heat pump, when carrying out freezing or heating, in order to the overload of anti-locking system, having and motor compressor forcibly quit work the control logic of (cut off).
When freezing (air conditioning mode), in the process of motor compressor work, if increase more than regulation as the discharge pressure of high side pressure, then in order to the durable of heat pump and safety, forcibly stop the work of motor compressor.
And, when heating (heat pump mode), because external air temperature is low, thus compared with when freezing, usually, the compression ratio of cold-producing medium uprises, and thus has following situation: even if under identical compressor revolution (rpm) condition, due to the overcurrent that load increase causes, motor compressor quits work.
Like this, when freezing if carry out or heat, motor compressor quits work unexpectedly (cut-off), then cannot perform the refrigeration in vehicle chamber and heat effect, thus existence can make the personnel of taking feel bad, further, due to restarting and causing the problem of noise and vibration repeatedly.
Prior art document
Patent document
Patent document 1:KR10-2008-0026983 A (on 03 26th, 2008 open).
Summary of the invention
The present invention proposes to solve problem as above, the object of one embodiment of the invention is, the control method of the motor compressor of vehicle heat pump is provided, control the revolution of compressor according to the discharge pressure of compressor, compressor out-of-work phenomenon unexpectedly can be prevented thus.
According to a preferably embodiment of the present invention, the invention is characterized in, comprising: temperature detection step, detect target temperature T _ targetwith indoor temperature T, revolution calculation step, according to the target temperature T detected in said temperature detecting step _ targetwith indoor temperature T, the revolution of computing compressor 300, discharges pressure detecting step, detects the discharge pressure P of above-mentioned compressor d, and revolution regulating step, when heating running, if above-mentioned discharge pressure P dfor the maximum higher limit that heats preset discharges pressure P d_h_maxabove, then reduce the revolution of above-mentioned compressor 300, if above-mentioned discharge pressure P dfor the maximum lower limit that heats preset discharges pressure P d_h_minbelow, then the revolution of above-mentioned compressor 300 is increased; After above-mentioned revolution regulating step, re-execute above-mentioned discharge pressure detecting step, after adjustment revolution, after the stipulated time, at discharge pressure P dalso be that the above-mentioned maximum lower limit that heats discharges pressure P d_h_minbelow, and indoor temperature T lower than above-mentioned target temperature T _ targetwhen, in above-mentioned revolution regulating step, increase the revolution of above-mentioned compressor with the switching rate of increase compared with former switching rate.
The invention is characterized in, in above-mentioned revolution regulating step, after the revolution reducing above-mentioned compressor, at above-mentioned discharge pressure P dfor the above-mentioned maximum higher limit that heats discharges pressure P d_h_maxabove, and above-mentioned indoor temperature T lower than above-mentioned target temperature T _ targetwhen, make positive temperature coefficient heater work.
The invention is characterized in, after the above-mentioned revolution regulating step of execution, be the minimum revolution rpm preset at the revolution of above-mentioned compressor _ minwhen following, compressor is quit work.
The invention is characterized in, in above-mentioned revolution regulating step, if above-mentioned discharge pressure P dpressure P is discharged for the restriction preset heats d_Labove, then above-mentioned compressor is made to quit work.
The control method of the motor compressor of the vehicle heat pump of another embodiment of the present invention, is characterized in that, comprising: temperature detection step, detects target temperature T _ targetwith indoor temperature T, revolution calculation step, according to the target temperature T detected in said temperature detecting step _ targetwith indoor temperature T, the revolution of computing compressor, discharges pressure detecting step, detects the discharge pressure P of above-mentioned compressor d, and revolution regulating step, when cooling operation, if above-mentioned discharge pressure P dfor the maximum refrigeration higher limit preset discharges pressure P d_c_maxabove, then reduce the revolution of above-mentioned compressor, if above-mentioned discharge pressure P dfor the maximum refrigeration lower limit preset discharges pressure P d_c_minbelow, then the revolution of above-mentioned compressor is increased; After above-mentioned revolution regulating step, re-execute above-mentioned discharge pressure detecting step S40, after adjustment revolution, after the stipulated time, at discharge pressure P dalso be that above-mentioned maximum refrigeration lower limit discharges pressure P d_c_minbelow, and indoor temperature T higher than above-mentioned target temperature T _ targetwhen, in above-mentioned revolution regulating step, increase the revolution of above-mentioned compressor with the switching rate of increase compared with former switching rate.
The invention is characterized in, in revolution regulating step, the revolution of above-mentioned compressor reduces with the switching rate preset.
The invention is characterized in, after execution revolution regulating step, be the minimum revolution rpm preset at the revolution of above-mentioned compressor _ minwhen following, above-mentioned compressor is quit work.
The control method of the motor compressor of vehicle heat pump according to an embodiment of the invention, when carrying out freezing or heating, controlling the revolution of compressor, the discharge pressure of compressor being remained in prescribed limit according to the discharge pressure of compressor.
Further, can prevent and make compressor out-of-work phenomenon unexpectedly because of overload, keep uniform indoor temperature, and prevent the phenomenon producing noise and vibration because compressor restarts, improve the perceptual qualities of vehicle.
Accompanying drawing explanation
Fig. 1 is the structure chart that existing vehicle heat pump is shown.
Fig. 2 is the sketch of the compressor control system that one embodiment of the invention is shown.
The precedence diagram of compressor control method when Fig. 3 is the refrigeration of one embodiment of the invention.
The precedence diagram of compressor control method when Fig. 4 is heating of one embodiment of the invention.
The explanation of Reference numeral
100: temperature sensor
200: pressure sensor
300: compressor
400: control part
500: memory
600: positive temperature coefficient heater
S10, S100: temperature detection step
S20, S200: revolution calculation step
S30, S300: compressor revolution setting procedure
S40, S400: discharge pressure detecting step
S50, S500: revolution regulating step.
Detailed description of the invention
Mentioned below " compressor " be the electrodynamic type compressor of the heat pump of formation vehicle, and it utilizes electricity to produce driving force, thus with the traveling revolution (rpm) of vehicle independently, freely can drive compressor.
embodiment
Fig. 2 is the sketch of the compressor control system that one embodiment of the invention is shown.According to one embodiment of the invention, transmit the discharge pressure P of the vehicle indoor temperature T value detected by temperature sensor 100 and the compressor 300 detected by pressure sensor 200 to control part 400 dvalue.
Control part 400 is substantially according to the target temperature T by running personnel setting _ targetthe revolution of compressor 300 is set, according to the discharge pressure P of the compressor 300 detected by pressure sensor 200 with current vehicle indoor temperature T d, control the revolution of compressor 300, control thus, make the discharge pressure P of the cold-producing medium of externally discharging from compressor 300 dremain in prescribed limit, with prevent compressor 300 unexpected quit work (cut-off).
With reference to Fig. 3 and Fig. 4, according to each step, watch respectively when heat pump carries out the method for the revolution heating running (heat pump mode) and cooling operation (air conditioning mode) time control compressor 300.
If heat pump starts to heat running, then first, detect by the target temperature T of running personnel setting by temperature sensor 100 grade _ targetwith current vehicle indoor temperature T (step S10), and transmit to the control part 400 of the side being positioned at compressor 300.
Control part 400 is according to the target temperature T detected _ targetwith indoor temperature T, revolution (rpm) (the step S200) of computing compressor 300, in the value according to the computing of above-mentioned control part 400, after the revolution of setting compressor 300 (step S300), controls the work of compressor 300.
Further, after the driving by compressor 300 is compressed, detect discharge pressure Pd (S400) of the cold-producing medium of discharging by pressure sensor 200 grade, and transmit to control part 400.
Control part 400 controls the revolution (step S500) of compressor 300 according to the discharge pressure Pd of compressor 300, if the discharge pressure Pd detected is restriction heat discharge pressure P d_Labove, then compressor 300 quits work (cut-off).Further, the discharge pressure P detected dfor the maximum higher limit that heats discharges pressure P d_h_maxwhen above, control, reduce revolution, the discharge pressure P detected dfor the maximum lower limit that heats discharges pressure P d_h_minwhen following, control, increase revolution.That is, control part 400 controls the revolution of compressor 300, makes the discharge pressure P of compressor 300 dremain on the maximum lower limit that heats and discharge pressure P d_h_minpressure P is discharged with the maximum higher limit that heats d_h_maxbetween in scope.
Wherein, after the stipulated time, discharge pressure P dstill for the maximum lower limit that heats discharges pressure P d_h_minbelow, and indoor temperature T lower than target temperature T _ targetwhen, increase the revolution of compressor 300.
Now, restriction can be preset and heat discharge pressure P d_L, maximum heat higher limit discharge pressure P d_h_maxand the maximum lower limit that heats discharges pressure P d_h_minvalue.As an example, heat and discharge pressure P d_Lpressure P can be discharged with 21kgf/cm2, the maximum higher limit that heats d_h_maxcan with 18kgf/cm2 and maximum heat lower limit discharge pressure P d_h_mincan be stored in memory 500 with data shape in advance with 17kgf/cm2, and control part 400 compares the data and discharge pressure P that are stored in memory 500 mutually d.
When reducing the revolution of compressor 300, control part 400 controls, reduce with the switching rate sr0 being pre-set in memory 500 thus, when increasing the revolution of compressor 300, control part 400 controls, make existing switching rate sr increase requirement ratio amount f, increase revolution.
With reference to Fig. 4, control part 400 compares discharges pressure P dheat with restriction and discharge pressure P d_L(step S510), and at discharge pressure P dpressure P is discharged for heating d_Lwhen above, compressor 300 is quit work (cut-off) (step S511).
Such as, if discharge pressure P dbe less than restriction and heat discharge pressure P d_L, then compare and discharge pressure P dpressure P is discharged with the maximum higher limit that heats d_h_max(step S520), at discharge pressure P dbe less than restriction and heat discharge pressure P d_Land heat higher limit discharge pressure P for maximum d_h_maxwhen above, be suitable for the revolution (step S521) that the switching rate (as an example, 50rpm/s) preset reduces compressor 300.
Now, be the minimum revolution rpm preset at the revolution of compressor 300 reduced _ min(as an example, 2000rpm) below when, in order to prevent fault, compressor 300 is quit work (cut-off) (step S511).Further, if the revolution through the compressor 300 of revolution regulating step reduction is greater than the minimum revolution rpm preset _ min, then current indoor temperature T (step S522) is detected.
Now, if indoor temperature T is target temperature T _ targetabove, then return to compressor revolution setting procedure S300, and drive compressor 300 according to the revolution reduced.
On the contrary, if indoor temperature T is lower than target temperature T _ target, then the heat of positive temperature coefficient (PTC, Positive Temperature Coefficient) heater 600 is made to increase (step S523).Now, if positive temperature coefficient heater 600 is in closedown (OFF) state, is then converted to and opens (ON) state, and the heat of positive temperature coefficient heater 600 can control according to the electric energy quantity delivered of supplied power supply etc.The heat increment rate of positive temperature coefficient heater 600 can suitably be selected as required.
On the other hand, if discharge pressure P dbe less than the maximum higher limit that heats and discharge pressure P d_h_max, then compare and discharge pressure P dpressure P is discharged with the maximum lower limit that heats d_h_min(step S530), at above-mentioned discharge pressure P dbe less than the maximum higher limit that heats and discharge pressure P d_h_maxand be greater than maximum heat lower limit discharge pressure P d_h_minwhen, return to temperature detection step (S100), and by according to indoor temperature T and target temperature T _ targetthe revolution drived control compressor 300 of computing.
If, at discharge pressure P dfor the maximum lower limit that heats discharges pressure P d_h_minwhen following, check the time (step S531), discharge pressure P in the maximum lower limit that heats of maintenance d_h_minwhen following time without the stipulated time, return to temperature detection step (S100).Now, maximum refrigeration lower limit is kept to discharge pressure P d_minfollowing time reference can suitably be selected as required.
Pressure P is discharged in the maximum lower limit that heats of maintenance d_h_minthe following time, through the stipulated time when, detects current indoor temperature T (step S532).Now, if the indoor temperature T detected is target temperature T _ targetabove, then again detect indoor temperature (step S100), the indoor temperature T miss the mark temperature T detected _ targetand when being in lower state, be suitable for the revolution (step S533) that switching rate sr increases compressor 300.
Now, the revolution of compressor 300 is the value being suitable for the value of switching rate sr on the revolution of existing compressor 300, above-mentioned compressor 300 is when initial increase revolution, be suitable for the slew rate values sr0 preset, when increasing continuously revolution afterwards, to make in preceding step the switching rate sr that is suitable for increase requirement ratio f amount to be suitable for (step S534).Such as, when make switching rate sr often increase by 50% to be suitable for, if the initial switching rate be suitable for is 50rpm/s, then the switching rate in second step is 75rpm/s, and the switching rate in the 3rd step is 87.5rpm/s.
The precedence diagram of compressor control method when Fig. 3 is the refrigeration of one embodiment of the invention.
If heat pump starts cooling operation, then first, detect by the target temperature T of running personnel setting by temperature sensor 100 grade _ targetwith current vehicle indoor temperature T, and transmit (step S10) to the control part 400 of the side being positioned at compressor 300.
Control part 400 is according to the target temperature T detected _ targetwith indoor temperature T, revolution (rpm) (the step S20) of computing compressor 300, according to the revolution of the value setting compressor 300 calculated, and controls the work (step S40) of compressor 300.
Further, drive compressor 300, and detect discharge pressure Pd (step S40) of the cold-producing medium of discharging by pressure sensor 200 grade, and transmit to control part 400.
Control part 400 is according to the discharge pressure P of compressor 300 dcontrol the revolution (step S50) of compressor 300, the discharge pressure P detected dfor maximum refrigeration higher limit discharges pressure P d_c_maxwhen above, control, reduce revolution, the discharge pressure P detected dfor maximum refrigeration lower limit discharges pressure P d_c_minwhen following, control, increase revolution.
That is, control part 400 controls the revolution of compressor 300, makes the discharge pressure P of compressor 300 dremain on maximum refrigeration lower limit and discharge pressure P d_c_minpressure P is discharged with maximum refrigeration higher limit d_c_maxbetween in scope.
Wherein, after the stipulated time, discharge pressure P dbe still that maximum refrigeration lower limit discharges pressure P d_c_minbelow, and indoor temperature T higher than target temperature T _ targetwhen, increase the revolution of compressor 300.
Now, maximum refrigeration higher limit can be preset and discharge pressure P d_c_maxand maximum refrigeration lower limit discharges pressure P d_c_minvalue.As an example, maximum refrigeration higher limit discharges pressure P d_c_maxcan with 31kgf/cm2 and maximum refrigeration lower limit discharge pressure P d_c_mincan be pre-set in memory 500 with 28kgf/cm2, and control part 400 reads these data from memory 500, and press Pd to compare with discharge.
According to one embodiment of the invention, when making the revolution of compressor 300 reduce, control, reduce with switching rate (slew rate) sr0 being pre-set in memory 500 thus, when increasing the revolution of compressor 300, controlling, making existing switching rate sr value increase requirement ratio (f, factor) measure, increase revolution.
With reference to Fig. 3, if control part 400 compares discharge pressure P dpressure Pd_c_max (step S51) is discharged, at discharge pressure P with maximum refrigeration higher limit dfor maximum refrigeration higher limit discharges pressure P d_c_maxwhen above, be suitable for the revolution (step S52) that the switching rate (as an example, 50rpm/s) preset reduces compressor 300.
Now, be the minimum revolution rpm being pre-set in memory 500 at the revolution of compressor 300 reduced _ min(as an example, 2000rpm) below when, in order to prevent fault, compressor 300 is quit work (cut-off) (step S53).If the revolution of the compressor 300 reduced through revolution regulating step (S50) is greater than the minimum revolution rpm preset _ min, then return to compressor revolution setting procedure (step S30), and drive compressor 300 according to the revolution reduced.
On the other hand, if discharge pressure P dbe less than maximum refrigeration higher limit and discharge pressure P d_c_max, then compare and discharge pressure P dpressure P is discharged with maximum refrigeration lower limit d_c_min(step S54).
Control part 400 is at discharge pressure P dbe less than maximum refrigeration higher limit and discharge pressure P d_c_maxand be greater than maximum refrigeration lower limit discharge pressure P d_c_minwhen, the temperature (step S10) again in sensing chamber, and by according to indoor temperature T and target temperature T _ targetthe revolution of computing drives compressor 300.
But, at discharge pressure P dfor maximum refrigeration lower limit discharges pressure P d_c_minwhen following, check the time (step S55), discharge pressure P in the maximum refrigeration lower limit of maintenance d_c_minwhen following time without the stipulated time, return to temperature detection step (S10).Now, maximum refrigeration lower limit is kept to discharge pressure P d_c_minfollowing time reference can suitably be selected as required.
On the contrary, pressure P is discharged in the maximum refrigeration lower limit of maintenance d_c_minthe following time, through the stipulated time when, detects current indoor temperature T (step S56).Now, if the indoor temperature T detected is target temperature T _ targetbelow, then again detect indoor temperature (step S10), the indoor temperature T miss the mark temperature T detected _ targetand when being in relatively high state, be suitable for the revolution (step S57) that switching rate sr increases compressor 300.
Thus, the revolution of increase is the value being suitable for the value of switching rate sr on the revolution of existing compressor 300.Now, when the revolution of initial increase compressor 300, be suitable for the slew rate values sr0 being pre-set in memory 500, when increasing continuously revolution afterwards, to make in preceding step the switching rate sr that is suitable for increase requirement ratio f amount to be suitable for (step S58).Such as, when make switching rate sr often increase by 50% to be suitable for, if the initial switching rate be suitable for is 50rpm/s, then the switching rate in second step is 75rpm/s, and the switching rate in the 3rd step is 87.5rpm/s.
As mentioned above, according to one embodiment of the invention, when vehicle heat pump carries out freezing and heating, the revolution (rpm) of compressor 300 controls in prescribed limit by the discharge pressure Pd according to compressor 300.Make compressor 300 out-of-work phenomenon unexpectedly therefore, it is possible to prevent because of overload, and prevent the phenomenon producing noise and vibration because frequently restarting, to improve perceptual qualities.Further, there is the durability of vehicle heat pump and the effect of stability that improve and comprise compressor 300.

Claims (7)

1. a control method for the motor compressor of vehicle heat pump, is characterized in that,
Comprise:
Temperature detection step (S100), detects target temperature (T_ target) and indoor temperature (T),
Revolution calculation step (S200), according to the target temperature (T detected in said temperature detecting step (S100) _ target) and indoor temperature (T), the revolution of computing compressor (300),
Discharge pressure detecting step (S400), detect the discharge pressure (P of above-mentioned compressor (300) d), and
Revolution regulating step (S500), when heating running, if above-mentioned discharge pressure (P d) for preset maximum heat higher limit discharge pressure (P d_h_max) more than, then reduce the revolution of above-mentioned compressor (300), if above-mentioned discharge pressure (Pd) for preset maximum heat lower limit discharge pressure (P d_h_min) below, then increase the revolution of above-mentioned compressor (300);
After above-mentioned revolution regulating step (S500), re-execute above-mentioned discharge pressure detecting step (S400), after adjustment revolution, even if discharge pressure (P after the stipulated time d) be also that the above-mentioned maximum lower limit that heats discharges pressure (P d_h_min) below and indoor temperature (T) lower than above-mentioned target temperature (T _ target) when, in above-mentioned revolution regulating step (S500), increase the revolution of above-mentioned compressor (300) with the switching rate of increase compared with former switching rate.
2. the control method of the motor compressor of vehicle heat pump according to claim 1, it is characterized in that, in above-mentioned revolution regulating step (S500), after the revolution reducing above-mentioned compressor (300), at above-mentioned discharge pressure (P d) for above-mentioned maximum heat higher limit discharge pressure (P d_h_max) more than and above-mentioned indoor temperature (T) lower than above-mentioned target temperature (T _ target) when, positive temperature coefficient heater (600) is worked.
3. the control method of the motor compressor of vehicle heat pump according to claim 1, it is characterized in that, after the above-mentioned revolution regulating step (S500) of execution, be the minimum revolution (rpm preset at the revolution of above-mentioned compressor (300) _ min) below when, above-mentioned compressor (300) is quit work.
4. the control method of the motor compressor of vehicle heat pump according to claim 1, is characterized in that, in above-mentioned revolution regulating step (S500), if above-mentioned discharge pressure (P d) discharge pressure (P for the restriction preset heats d_L) more than, then make above-mentioned compressor (300) quit work.
5. a control method for the motor compressor of vehicle heat pump, is characterized in that,
Comprise:
Temperature detection step (S10), detects target temperature (T _ target) and indoor temperature (T),
Revolution calculation step (S20), according to the target temperature (T detected in said temperature detecting step (S10) _ target) and indoor temperature (T), the revolution of computing compressor (300),
Discharge pressure detecting step (S40), detect the discharge pressure (P of above-mentioned compressor (300) d), and
Revolution regulating step (S50), when cooling operation, if above-mentioned discharge pressure (P d) discharge pressure (P for the maximum refrigeration higher limit preset d_c_max) more than, then reduce the revolution of above-mentioned compressor (300), if above-mentioned discharge pressure (Pd) is discharged for the maximum refrigeration lower limit preset press (P d_c_min) below, then increase the revolution of above-mentioned compressor (300);
After above-mentioned revolution regulating step (S50), re-execute above-mentioned discharge pressure detecting step (S40), after adjustment revolution, even if at discharge pressure (P after the stipulated time d) be also that above-mentioned maximum refrigeration lower limit discharges pressure (P d_c_min) below and indoor temperature (T) higher than above-mentioned target temperature (T_target) when, in above-mentioned revolution regulating step (S50), increase the revolution of above-mentioned compressor (300) with the switching rate of increase compared with former switching rate.
6. the control method of the motor compressor of vehicle heat pump according to claim 5, it is characterized in that, in above-mentioned revolution regulating step (S50), the revolution of above-mentioned compressor (300) reduces with the switching rate preset.
7. the control method of the motor compressor of vehicle heat pump according to claim 5, it is characterized in that, after the above-mentioned revolution regulating step (S50) of execution, be the minimum revolution (rpm preset at the revolution of above-mentioned compressor (300) _ min) below when, above-mentioned compressor (300) is quit work.
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